Resistance



OCt- 31;, 1933.

M' w WIEISOPF.

RESISI'ANCE Filed Dec.

L uw! /5 lNVENToR ATTORNEY s Patented Oct. 31, 1933 PATENT i OFFICE RESISTANCE Marcus W. Weiscopf, Philadelphia, Pa., assignor to International Resistance Company, Philadelphia, Pa., a corporation of Delaware Application December 18, 1930 Serial No..503,135

5 Claims. (Cl. 201-63) The invention relates to a mounting for resistors.

One of the objects of the invention is to provide a mounting for resistors on which the resistors may be quickly and easily assembled. Another object of the invention is .to provide a mounting for resistors which may be manufac-g tured at a minimum cost. Another object of the invention is to provide a mounting for resistors which is durable. Another object of the invention is to provide a mounting forl resistors so that the resistors may be mounted in a gang, thereby taking up a minimum amount of space in a radio cabinet or other apparatus in which the'resistors are used. Another object of the invention is to provide a convenient mounting for resistors in a gang whereby the resistors may be connected `in a great number of different circuits `with -great ease. Another `object of the invention is to provide a light weight gang resistor assembly adapted for ,a variety of uses. Another object of the-:invention is to provide a resistor adapted to b uickly Amonnted'on a support. Other object' will be in partobvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements,

and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawing, in which is shown one of various possible embodiments of the mechanical features of this invention,

Figure 1 is an elevation of a single resistor before mounting,

Figure 2 is a longitudinal sectional view of the resistor,

Figure 3 is4 a front elevation of a gang of resistors and the mounting therefor,

Figure 4 is a rear elevation ofthe mounting for the gang of resistors,

Figure 5 is a side elevation of the' gang of resistors and the support or mounting therefor,

and

Figure 6 is a sectional view taken on the line 6-6 of Figure 3.

Similar reference characters refer to similar parts throughout the several views of the drawing. g

Referring first to Figures 1 and 2, the resistor, indicated generally by the numeral 10, preferably consists of a rod or bar of porcelain or other insulating substance 11 having a capillary passage 12 through which extends a resistance conductor 13 embedded in metal end pieces 14, 14. The resistance conductor 13 preferably comprises aglass rod or filament covered with a conductive coating of high resistance material, such as carbon. The conductor 13 is in intimate instead of bakelite.

contact with the wall of the capillary passage 12, the diameter of the conductor being preferably as near to the diameter of the capillary pas-4 The metal end pieces 14, 14 are rigidly connected to the porcelain insulator rod 1l. This may be done by relating the rod and the projecting ends of the resistance conductor 13 which is supported by the rod 11 to a suitable mold, and molding the metal end pieces 14, 14 on said insulating rod 11, thereby completely embedding the resistance conductor 13, as is clearly shown in Figure 2. Preierably'the metal end pieces 14, 14 'are of readily moldable metal such as type metal, which in cooling contracts and rmly grips the ends of the porcelain rod 11 so as to form a firm and rigid body.

Formed on the molded metal end pieces 14, 14 on the sides thereof arel a pair of projections 15, 15 which are desirably cone shaped. The mechanical and electrical union between each tute at the same time conductors and connectors, and preferably are integral with the `metal end pieces 14, 14.

Referring now to Figures 3, 4 and 5, I provide a rectangular sheet of insulating substance 16. Preferably this substance is bakelite or a phenolic condensation product which is strong, not brittle, has a high dielectric strength, and is not damaged by water or oil. One of the features of my invention is that the iinished gang of resistors may be given relatively hard usage without breaking. In accordance with certain features of my invention, other? substances such as hard rubber and sheet fiber might be used One of the advantages of having the rectangular sheet 16 of bakelite is that bakelite is impervious to moisture, and

. consequently the possibility of leakage of current between the projections l5, 15 along the insulating substance 16 in damp weather is thereby 'eliminated Along one edge of the sheetof insulating material 16 I punch a row of holes 17 of uniform size and diameter. Along the other side of the sheet 16. I punch another row of holes 18, likewise of uniform size and diameter. Any pair of holes 17 and 18 opposite each other preferably are the same distance apart as any other pair of holes 17 and 18 opposite each other, and the distance between any such pair 17 and 18 is the same as the distance between the projections 15, 15 of a resistor 10.

I provide a plurality of terminals 2 0 preferably made of sheet metal, such as of sheet brass coated with tin. Each terminal 20 has a generally circular portion 21 having a central hole of substantially the same size as the holes 17 and 18. Each terminal 20 further has a somewhat smaller generally circular portion 23 having a central hole 24. The portions 21 and 23 are connected by connecting portions 25 which may be gently curved to merge into the curve of the circular portions 21 and 23, as shown.

There is provided a number of terminals 20 equal to the total number of holes 17 and 1B, a-

terminal 20 being fastened to the sheet 16 at each of the holes 17 and 18. The terminals are preferably fastened in place by means of tu bular metal fasteners 26 which may be of 'the type used to fasten papers together. First a terminal 20 is placed on the sheet 16 with its hole 22 over one of the holes- 17 or 18; next a fastener 26 having a flange 27 yis inserted through both holes; then, by means of a suitable tool, the cylindrical end ofthe fastener 26 that projects through the back of the sheet 16 is expanded, to form, as is best shown in Figure 6,an expanded portion 28. This fastens the terminal 20 rigidly to the sheet 16. In the same way a terminal 20 is attached to the rectangular sheet at each one of the holes 17 and 18, with the connecting portions 25 in generally parallel relation and those of the row of holes 17 projecting oppositely from those oi the terminals 20 which are fastened to the sheet at the row of holes 18.

A plurality of resistors l0 are now' mounted on the sheet 16 by placing the projecting portions 15, 15 in the tubular metal fasteners 26, one projection 15 of each resistor being placed in a fastener 26 in the row 17, and the other projection 15 of each resistor being placed in a fastener 26 in the row 18 opposite the firstnamed fastener. The projections 15, 15 are securely fastened in the tubular fasteners 26 and are, furthermore, electrically connected to them by inserting a drop of solder in each of the fasteners at the end opposite the resistors 10.

In opposite ends of the sheet 16 are holes 30 through which may be inserted screws to fasten the complete resistor gang in any electrical apparatus, such as in a radio cabinet or box.

Metal clips or connectors 32 consisting of a wire or strip of metal bent over at the ends may be now placed over the terminals 20, as illustrated in Figure 3. These connectors or clips 32 may be made in suitable lengths to include between them either two, three, four or any greater number, of the terminals 20. The connectors 32 are preferably fastened to the terminals 20 by soldering, thus making a good electrical union. The resistors l0 may be connected to any desired circuit in series, in parallel, or they may be connected to different circuits in a variety of ways. A wire conductor may be readily connected to a terminal 20 by placing the end of the wire through the hole 24 in the portion 23 of the terminal 20 and twisting it. The connections can be quickly made by reason of the advantageous construction described, and the entire unit is simple and easily handled.

It will thus be seen that there has been provided by this invention an apparatus in which the various objects hereinabove set forth, tcgether with many thoroughly practical advantages, are successfully achieved.

As various possible embodiments might be made of the above invention, and as many changes might be made in the embodiment above set forth, it is to be understood that all matter `hereinbefore set forth, or shown in the accompanying drawing, is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In apparatus of the class described, a rectangular sheet of insulating material, there being a row of holes near both sides of the sheet and the rows being parallel, a plurality of elongated sheet metal terminals having holes therein at opposite ends, a plurality of tubular metal fasteners, the terminals being fastened to the sheet by the fasteners, being attached in pairs at opposite holes by the fasteners and projecting oppositely from the sides of the she't, a. plurality of resistors comprising insulating rods having therein resistance conductors, metal end caps on the ends of the insulating rods, metal projections projecting sideways from said caps, each resistor being attached to a pair of terminals by means of the projections and the tubular fasteners, the projections fitting in the fasteners and being soldered to them, the resistors thus being located in parallel relation with the metal end caps in line, and one or more connectors having hooks hooked over the metal terminals to connect the resistors in circuit with each other or with electric apparatus.

2. In apparatus of the class described, a re sistor, a resistance element in said resistor, metal end caps on the ends of said resistor, metal projections projecting sideways from said end caps, a sheet of insulating material having holes, terminals, and tubular fasteners, the tubular fasteners being located in the holes in the sheet and also in holes in the terminals to fasten said terminals to said sheet, and the projections being located in and attached to the tubular fasteners.

3. In apparatus of the class described, a resistor, a resistance element in said resistor, metal end caps on the ends of said resistor, metal projections projecting sideways from said end caps, terminals, and tubular fasteners, the tubular fasteners being located in holes in the terminals, and the projections being located in the tubular fasteners.

4. In apparatus of the class described, a resistor, metal end caps on the ends of said resistor, and integral conical metal projections extending laterally fromsaid end caps.

5. In apparatus of the class described, a resistor comprising an elongated body, an annular metal portion around each end of said body and constituting part of a. metal terminal for said body, a laterally projecting lug integrally formed with said annular metal portion, means directly connected to said laterally projecting lug for attaching said resistor to a panel, and a separate fiat metal terminal member having an orifice therein for the attachment of wires, said flat terminal member being connected to the means for attaching the resistor to a panel.

` MARCUS W. WEISCOPF. 

